PS.5.2 Post-Test Review

What can cause a moving object to increase its speed in a forward direction?

• a force pushing on the object from the opposite direction

• a force that continually acts on the object in the direction the object is moving

• an increase in the mass of the object

• a decrease in the mass of the object

When a wagon is moving down a hill, what force is primarily acting against its motion?

• Gravity

• Friction

• Wind

• Magnetism

Fill in the blank: The mass of an object affects its _______ when moving down a hill.

• speed

• color

• shape

• sound

What happens to the speed of a wagon as it moves down a hill?

• It increases

• It decreases

• It stays the same

• It disappears

Fill in the blank: As a wagon moves down a hill, _______ helps it to eventually stop.

• friction

• speed

• color

• shape

Which of the following statements is true about friction?

• Friction always slows things down.

• Friction can never be useful.

• Friction only occurs on rough surfaces.

• Friction is not affected by the type of surface.

Which of the following is NOT a way to reduce friction?

• Adding oil to a machine.

• Using ball bearings.

• Making a surface rougher.

• Polishing a surface.

Which of the following is an example of increasing friction to improve safety?

• Installing anti-slip mats in a bathroom.

• Using a fan to cool a room.

• Wearing sunglasses on a sunny day.

• Drinking water to stay hydrated.

Friction can be increased by using a rough surface. Which of the following surfaces would increase friction?

• Smooth glass

• Polished wood

• Rough sandpaper

• Wet ice

Which of the following is an example of friction being reduced for efficiency?

• Greasing a bicycle chain.

• Using a rough towel to dry hands.

• Walking on a gravel path.

• Writing with chalk on a blackboard.